The WFP’s Office of Evaluation (OEV) undertakes Impact Evaluations to assess the impact of specific type of WFP’s programming activity applied across a series of countries. WFP’s OEV applies a mixed method approach focusing on outcomes and impacts, causal contribution and explanatory factors. Where possible, Impact Evaluations are conducted in series on the same type of programs in several countries. This enables OEV to synthesize findings across countries and identify common strengths and weaknesses to inform future policy and programming strategy. Whenever possible, Impact Evaluations are also used to strengthen the evidence base for other Strategic or Policy evaluations.